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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16e4852e9e132c57713fbad788707922291dd0dd29a33a15776b1459b6801f7b' 
  AND token = 'q6cPw7PWwqbykaoeVQPxBLem9Nl3xeI/Ze3B4R13UPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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