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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2311a2f1dc9d24c4b357cfe54d0f5faf9984d88cfa1a77901c9b4c683980a39' 
  AND token = 'Uf0G3qIkSuB6u2rDz1bsJ9RNN2EQUseYoDgdtXoUhjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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