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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '132dbac861b2005cfb403e00ed40e15343cf46fbf8534ff7c29fd3e6f6678c57' 
  AND token = 'da8Xd196qQ5xAY4AyelDRR/Se6d6cFA9ZgDsG8cTO40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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