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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d960f3693a66a1c08401120b0f8dbb10bc78130029e517794b3ae0d962e518' 
  AND token = 'ARFhykwnWKZqSV903OcOTzgb5Wz6qV3uPYzcJys/JVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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