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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f86055a7544e4db03d96b2d1441a6a05b93bb82b8120af919861a245c500e38' 
  AND token = 'gaqWEWWn6ARaonupsIDozkCqJU12njkd7pK1n5TQ9Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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