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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fd4538e04b39895fac9b1a8856bbf29a34f1b72a541318dc0a5c10ae32b1f5f' 
  AND token = 'rz9LSeRLdDw0PKq2OKFICvjrX59vberAIFV3wXX5OiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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