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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd79e5a6dec9c97e64f0f08daef544d04b3817efc71d6c5c86365761eef4ed9e4' 
  AND token = 'm85nVLahHI9++9V/HGecKCnSQRK/Cvem73BikMdImQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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