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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32ceba7a4b1bc0a3db312695eec703eda65044e1b6d855780960538e3975c07f' 
  AND token = '6+hXs2nLoES2V+/7rHHwJaNWxD2TddB86RsBA6ftlEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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