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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1975cd5f201adea1f124a0b44b84651f9cd495e039dd55307225c47f3602e16' 
  AND token = '4CN7D09I6oVv3VRPicXXyussgI44Ohmvs0G2GJRM8BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}