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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f0e901e8b3679c9533399b5c80c7c7d7184c728838ac0ab1db3d142afcc2520' 
  AND token = 'pT6boaJ8Ee0Hah8h+r/Fr1sLwZmr5qblzbE4785W0o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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