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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0269e6582b44c6e6135847a436a934aa92e45d26669a44339824aaad5885d81e' 
  AND token = 'i6YFF3z1EjPh8pQOwpGfOOPinBXblLNiRc0G5iEs11M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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