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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3698dec5c26b8a46e3f43cfc9ad11ad399d7fd777048c3977004f1919e9ad9d8' 
  AND token = 'EZ6p+W3xjI94FOxj2l+cMfMZlJfK79jNfbXKUauXnrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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