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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bedf8cf45a86ffd4ce8228fe3204ec660668fdd735dc80bdf9f2ff0e8041d7aa' 
  AND token = 'zWyySQ6k75fj/Ok+Y9HjlYUcSpo0cRelKRJfkNrmeyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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