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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '781529748ac057e1d76b4231ca61f57d6612c7fd39778fb27c37ba1b7be1ad01' 
  AND token = 'fKSe/G1mOGOjtEWzVAXraGta4Y3hbILhCT6KJckBtoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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