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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e590a475ef32a943fdf643bc9d051415ba26594d173f0d878d5f4ea0b18e1b12' 
  AND token = 'pkWCy4IflE+PbndqbWl5UShOakNArwKAoNdKvcRGcyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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