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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ce6b7ba644993f9e137ae6d777e970f0598cbf5ec97455a134e6d6915043a3a' 
  AND token = '3WGu89Elq0/u0YsS8TUvCr1wWyPr2BMn5WEQsEZROZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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