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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c0d69feb6a39cc79fe6f7a9b0cc3848de9b03d0a07350f2d4db344587dac3ea' 
  AND token = 'RVF214ISNZp0YPwr3/tuxIqYXc/dIUbbEnxgMW6S754=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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