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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '604a89870cbf9fc2abb864245b79b2aed445c90cc686d6ea9225aa3ae80d7d9f' 
  AND token = '/EZO4jUANKbcogHrEeSG7DFHwJHL1epsPM6RMQhFToI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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