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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2945cd44e845443a098055e6e924dd2d9ffa881bf363e9412a830de8814f4418' 
  AND token = 'fe9v2fg6JEPgLDjHJg/DqTXTye9FijA3kLtOo3EUEo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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