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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd054781a8e87820c180591c8e15ff8e6c05ddbacfc5dc3caa0fffe401af494' 
  AND token = 'ZB2ZiengQzaXhebP1o6qsf5162mcawYED0mQUR9L1/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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