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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2717c04f30ed565d6dff3ed95c2943d24d5dee1861e53ca1d67a16ecf367e522' 
  AND token = 'umsix/hTkz96ZwystHnElXdySAOJs1mAgGZYcnGiA+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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