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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3160d87ed1876f2d7f6a99087b20aa8b2334f4b81981305962af357db9d5bfc6' 
  AND token = 'eVEQFcFhRstAigeJOJ+sBtASisSH2r3ra/8ciT9BHU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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