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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3df46ee0121c58ea4ba8df807e8b90d62dbefb0b51560b04d27bc275fdb1a3a5' 
  AND token = 'kt64pj1JoHlwsjoGtYYI1woGdZRM58C3zOHz7MUwYJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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