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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '675e2a1374ab8ddd7d8c50439f510f99c2a699b70de636480634f76e69eaf31d' 
  AND token = 'DYyQInZm8mjX1l+m0aBKX14jksVBiI4km+4xgnIcfo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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