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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2339b22b13a41f355c9d7c3b9413aef10dc6464b2427995cf735caf58ef217a9' 
  AND token = 'rjUbAco+F8pF7SOIEMwmJarrRv9BZvfCBza6Jx7NUoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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