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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04fd17314dabdd2cab66caebee5f8d1c34dcec009ee0b8da2333ff1bb517adc6' 
  AND token = 'wrtLc9+NLzsmCFIFqfaV24fr+PakX5Bb93rXDBLpgmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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