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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10f9082c1e4c2f3aeab3fbc4fd24b7b3b4410145335a474765e6631eb3d1d7e9' 
  AND token = 'YjSc0O5stsFf84orw1kJUk3fJypPfVDaILTl56yX7po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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