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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fde54c2309c3e5b8cc52667bfb83b4ccfbb95704e0d04c42f02631119492374b' 
  AND token = '3uBRnpiaIig59EGrGzvvm8i1m9gEbaY3gXKkV1xy7yA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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