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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3810dbce338810136968025168e0cfde5c8f3d26a461cf0b46c1c1997b3b429' 
  AND token = 'Kbrl18QkMX8lhXE/Lrxbr5v7mqnF3t07Z7eYKZCOJUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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