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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d584c1373d990d96e90e0494e2337bfcc23a9b042d60a82a67921e4cefa8a5' 
  AND token = 'Am4DERA0wyCIXu0TgbZNNUKK/iIZVG1fz2ePE9zWjk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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