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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3acf007a042779a13801a0eb64f4db20286c31cf2d2466ea1e494dc1186ffa99' 
  AND token = 'Ws2xwEhCubNUDLGTZ4MletIZC3jyrZy9cxz4LnMyTeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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