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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a1df7bc76f4a9ac7a6edf1ac514413c257447566be6b7f783e723868bbd3e0c' 
  AND token = 'VFWm87smsDfw3DzN0ySTOKs+r6djwhNu/AMoialdLGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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