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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd43ad8348e49fd7262a9b21d32cdcea6cbf6b5c2e93bfda209f7d93c9b4a8fc' 
  AND token = 'YNUsRGRzVsy8Bw5o1ofrehf0gej0C7KclWKMFG/RYLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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