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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aff735f7cfcfbef9e407a761fbf66711b95eca49c5d2b226b151de41d1ee0534' 
  AND token = 'yMIu6SZY7Ha39gteYgtraikbQllM0SycmQO7tPhkruI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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