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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9c99ec4a2c2c62120e74fa5373d820bf7915b20fea38256397a1cfa8382e675' 
  AND token = 'gsDQGfTW6F2mebj7MikNFAwhuRIcdrUe/UuvxpumJmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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