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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4de6eb8bbad6a39097fa93be169dc9b481ab7c495f8a8bb5e316a98fdcb6ca2' 
  AND token = 'ZooXDqTNAIjL8xnTINNbGdKdTNZub5s9lCQ185xnDKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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