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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e411e5bc4c2835d40565711485db45b4be4593a3457db7b68d8e63657a62d5' 
  AND token = '8mVktuhabvmCxLcu6WaXzNrEtgIuvDJBDeyox99+EY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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