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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '074e8285bbb6d492bdefe24a120216d1dba72d2b0d6cedc6635a0aa15bcfe891' 
  AND token = 'nL8JpUbZjKXfUga6RbjaEHdX0r5smWzj6s+nIVao0RM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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