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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f60a187e3f7dd5e9005c502a89ad2a0c05a963b8e1e30af01479c049ea49ac' 
  AND token = 'ey3eRDdmWMCRS2t61xtCp+jRfHoktPr7l5VlLY1o+PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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