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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87f4130ba1fe4a8862518e148b3549a281cab13caf067e6cf80ac2acb70df612' 
  AND token = 'qMGInR/isx1N5CFbd7imak6btnQUnCFAIHw17X/Cp5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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