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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee002199ce4c5c3b703dc126c65f28ceb49fef84018218f7d56c4039ceddae47' 
  AND token = '46Q1plqul9TEOMkk7PRXAIOa2Lpp5vPzPsUz/Wuf80A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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