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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a01414a18666976a5e0ae87c2da4e7a507c5eb2cfc007173390ea43b4723341b' 
  AND token = 'rwu1B7TcSwkoBXMZD8wgSuRGICaeQmafMIGqN4UwItw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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