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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '905d9240e787eb858315379718f94ddf5169b59ea0daa30695581b6664a4ca89' 
  AND token = 'IPrGhEx95W5dDQts6q5Uf2gpoOOZ+KybfVKbD51GNBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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