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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '848fa16e2cfd251d0201d17a91c66c18ac775554b632d78777231e33c3d5ce5d' 
  AND token = '3aX3xyyWK/6dX7qEpcA8cJPsW0tHfLGfFIXyRFubyWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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