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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '791b3c8e647a4298e9e4a3137961cf13e4d4ad586f48322c78697b1cb7204d63' 
  AND token = 'VUzTMOg6I6GqotzKcVcLXcqFKbTc6DMf3+tRGAsZkWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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