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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9982ab15fad2b77e38d223ed3420356cb6452a171650cddae6c010397c4f3713' 
  AND token = 'GOpPui80ahs6xgCLBle1r5+bTm3eSilSKeWVIQOK/+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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