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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2637f42ae8caeef5159b4f4fadef0ca1cfcd765f458fb3af3aff073c83f11d0' 
  AND token = '9CEJC1fasSrpx8KWMkw2XPEt1rVZLzg7aDYeU7SLaQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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