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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c21d0058141949588b146b97e1d916ce8c5db99e1c1a7a7029bed00f2380b042' 
  AND token = 'i4X5J6VtROOrcEk/6cndaT50qvGs/VHtv/lmAf8ksrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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