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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6ce2466acf6e61210e706b4924f7d141929719b5f9b260bab752cbb1c1cf1a0' 
  AND token = 'qYXd49IObGLmyXarsrl3Ui1Lm8t/LJHQPvCCrCjmnPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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