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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c197f5a5841ee157104da8c3341214df3838f4044aafe4d708a1eabe677d8a2' 
  AND token = 'sKNNYONXUPgtx1l2pTAkxlvWe+XU92B40C8zXcUG5+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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