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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c6310342dd423b0378c4f778b4c9c740a47607b0daa7aecff908f9f32ae78e5' 
  AND token = 'bazwjF+Rq9mE4rHbFalvTp36+dQTrrfSn5Nymx7Abx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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