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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd771cc007ae63c98908382e2dcda6b4ad6703bd9a0c89642812339b314a52c1d' 
  AND token = 'QdoWkTHB3VLomgaTSX/Xr7CbLtO1wgqL6sjAaCDjKrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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