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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a083d65ee4abf51fd4e27e6120f5682cb6fec7e98a635e4db1af39ab8942a6e1' 
  AND token = 'r60YAMco2+wj64tLU5otNqag/zl47XcpN7N6zWqF/xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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