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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '319a233296d7a1c522c825c5732631d3b1f22cf14da46a3a4f6c277802498d6e' 
  AND token = 'EHZ76oc9iqW+xMCcsooPj7AwBxoRGFSaWL5AeALTFF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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