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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83d44348c1da5b6ebbacaba23d7426d25518eb6042222efd14bf38a40812f524' 
  AND token = 'pghAOO0I+6ct8PENulpkDG5lTJzIuMj9lsSOAKWVgS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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