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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b87fe9a00e711d6316e7a8cce424be33f457c780edfdf3e55ed9026e21c434e' 
  AND token = 'jZntxnv+qHi6LqB+RJoRQQ07Kcw/DAiM8DX6dbygbJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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