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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '088faade403b3d7ae79901cfef6b58b9ed7f7f8b8ce0d4d52247eb82fb12720a' 
  AND token = 'Gxv4aJEkA0i0wicb/pkSrUope3b5FNQX0ygM4ojKFPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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