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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4617af6abe0dc09c44cc9ac38acdc9446d4ac925df804bc818746fce078ecffd' 
  AND token = 'Z3Vred3YHEUGN/7BcDk1AQx+vXZfWONbs+0a4a4l1Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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