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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a343c790ec5cc9130f3fdc725a6cff36a2eeb86cfb87758930a7be6abe41d2b8' 
  AND token = 'Mr7IKkllrzO2ezGuCCPaylM9agEtA76pjvqQBMK4lks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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